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 $D01A/53274/VIC+26:  Interrupt Mask Register (IMR)

   1 = IRQ enabled

   +----------+-------------------------------------------------------+
   | Bit 7-4  |   Always 1                                            |
   | Bit 3    |   Light-Pen Triggered IRQ Flag                        |
   | Bit 2    |   Sprite to Sprite Collision IRQ Flag     (see <A HREF="VIC30.HTM">$D01E</A>) |
   | Bit 1    |   Sprite to Background Collision IRQ Flag (see <A HREF="VIC31.HTM">$D01F</A>) |
   | Bit 0    |   Raster Compare IRQ Flag                 (see <A HREF="VIC18.HTM">$D012</A>) |
   +----------+-------------------------------------------------------+

   An IRQ will be initiated, if equal bits are set in IRR and IMR.
   Default Value: $00/0 (%00000000).

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